鸿蒙实现 SM3 算法，api10开始支持

import { cryptoFramework } from '@kit.CryptoArchitectureKit';
import { buffer } from '@kit.ArkTS';
import util from "@ohos.util";


interface YXGMResp {
  hex?: string | null;
  base64?: string | null;
  data?: Uint8Array | null;
}

/*
 *  字符串 Base64 编码
 * */
static strToBase64(aStr: string): string {
  if (aStr.length == 0) {
    return "";
  }
  let base64 = new util.Base64Helper();
  let arr = new Uint8Array(buffer.from(aStr, 'utf-8').buffer);
  let base64Str: string = base64.encodeToStringSync(arr);
  return base64Str;
}

/*
 *  uint8Array Base64 编码
 * */
static uint8ArrayToBase64(arr: Uint8Array): string {
  if (arr.length == 0) {
    return "";
  }
  let base64 = new util.Base64Helper();
  let base64Str: string = base64.encodeToStringSync(arr);
  return base64Str;
}
/*
 *  uint8Array 转 Hex 16进制字符串
 * */
static uint8ArrayToHex(arr: Uint8Array): string {
  if (arr.length == 0) {
    return "";
  }
  let hex: string = "";
  arr.forEach((value) => {
    let hex2 = value.toString(16);
    hex += (hex2.length < 2 ? ("0" + hex2) : hex2);
  });
  return hex;
}

/*
 *  SM3 摘要算法
 * */
static async sm3(aStr: string): Promise<YXGMResp> {
  if (aStr.length == 0) {
    return new Promise<YXGMResp>(reslove => {
      reslove({
        hex: "",
        base64: "",
        data: new Uint8Array([])
      });
    });
  }
  let mdAlgName = "SM3";
  let message = aStr;
  let md = cryptoFramework.createMd(mdAlgName);
  await md.update({ data: new Uint8Array(buffer.from(message, 'utf-8').buffer) });
  let mdResult = await md.digest();
  let base64Str: string = this.uint8ArrayToBase64(mdResult.data);
  let hex: string = this.uint8ArrayToHex(mdResult.data);
  return new Promise<YXGMResp>(reslove => {
    reslove({
      hex: hex,
      base64: base64Str,
      data: mdResult.data
    });
  });
}